panic: excl->share Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 320965 24352 0 0 0x4000000 0 syz-executor *489843 27557 0 0x14000 0x200 1 softclockmp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001598078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001598060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806b2ac3f0,ffff800001598000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806b2ac3f0,ffff800001598000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806b2ac300,ffffffff83987338,0,0,ffff80002a1fe590,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015aff80,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline] mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369 pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffea60) at softclock_thread_mp+0x86 end trace frame: 0x0, count: 3 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: excl->share ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001598078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001598060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806b2ac3f0,ffff800001598000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806b2ac3f0,ffff800001598000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806b2ac300,ffffffff83987338,0,0,ffff80002a1fe590,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015aff80,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline] mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369 pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffea60) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a1fe1e0 rbx 0xffff8000299dee07 rdx 0 rcx 0xffff8000ffffea60 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x20869374d5d484fe r11 0x57ad62347e406b15 r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff817c1d35 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a1fe1d0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (softclockmp) tid=489843 pid=27557 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=0, usrpri=50, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffff758,0xffff8000ffffe540 process=0xffff8000ffff89a0 user=0xffff80002a1f9000, vmspace=0xffffffff838bee00 estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 24352 158700 77739 0 2 0 syz-executor 24352 320965 77739 0 7 0x4000000 syz-executor 424 4695 72295 0 2 0xc80 syz-executor 424 341346 72295 0 3 0x4000080 ttyretype syz-executor 424 35784 72295 0 3 0x4000080 fsleep syz-executor 82462 363385 0 0 3 0x14200 acct acct 80025 325652 90677 0 3 0x80 nanoslp syz-executor 80025 381090 90677 0 3 0x4000080 msgwait syz-executor 80025 353651 90677 0 3 0x4000080 msgwait syz-executor 80025 511749 90677 0 3 0x4000080 fsleep syz-executor 73535 265443 3456 0 3 0x80 nanoslp syz-executor 73535 48850 3456 0 3 0x4000080 msgwait syz-executor 73535 5886 3456 0 3 0x4000080 fsleep syz-executor 8826 197496 58350 0 2 0xc80 syz-executor 8826 501592 58350 0 3 0x4000080 ttyout syz-executor 8826 101274 58350 0 3 0x4000080 fsleep syz-executor 61875 198756 0 0 3 0x14280 nfsidl nfsio 81412 200629 0 0 3 0x14280 nfsidl nfsio 99061 252367 0 0 3 0x14280 nfsidl nfsio 48803 11528 0 0 3 0x14280 nfsidl nfsio 32257 165401 0 0 3 0x14280 nfsidl nfsio 65450 338986 0 0 3 0x14280 nfsidl nfsio 22649 383040 0 0 3 0x14280 nfsidl nfsio 11753 262479 0 0 3 0x14280 nfsidl nfsio 74789 7634 0 0 3 0x14280 nfsidl nfsio 8640 297815 0 0 3 0x14280 nfsidl nfsio 56348 116466 0 0 3 0x14280 nfsidl nfsio 56767 275407 0 0 3 0x14280 nfsidl nfsio 71532 384864 0 0 3 0x14280 nfsidl nfsio 28325 463738 0 0 3 0x14280 nfsidl nfsio 40738 479532 0 0 3 0x14280 nfsidl nfsio 11913 248790 0 0 3 0x14280 nfsidl nfsio 29781 245575 0 0 3 0x14280 nfsidl nfsio 9773 118410 0 0 3 0x14280 nfsidl nfsio 58452 147288 0 0 3 0x14280 nfsidl nfsio 10780 289646 0 0 3 0x14280 nfsidl nfsio 93553 516927 98595 0 3 0x100082 sbwait arp 98595 25537 70999 0 3 0x10008a sigsusp sh 90677 71977 42133 0 3 0x82 nanoslp syz-executor 70999 104992 42133 0 3 0x82 wait syz-executor 3456 124298 42133 0 3 0x82 nanoslp syz-executor 86958 340919 42133 0 3 0x82 nanoslp syz-executor 77739 373024 42133 0 3 0x82 nanoslp syz-executor 77117 365742 42133 0 2 0xc82 syz-executor 72295 456032 42133 0 3 0x82 nanoslp syz-executor 58350 520059 42133 0 3 0x82 nanoslp syz-executor 42133 16607 23400 0 3 0x82 kqread syz-executor 23400 177698 27329 0 3 0x10008a sigsusp ksh 27329 221726 5828 0 3 0x98 kqread sshd-session 5828 84015 66614 0 3 0x92 kqread sshd-session 46531 252623 1 0 3 0x100083 ttyopn getty 66614 221657 1 0 3 0x88 kqread sshd 79938 307876 90168 74 3 0x1100092 bpf pflogd 90168 124679 1 0 3 0x80 sbwait pflogd 66698 513052 43203 73 3 0x1100090 kqread syslogd 43203 257989 1 0 3 0x100082 sbwait syslogd 88109 47002 1 0 3 0x100080 kqread resolvd 9811 217703 54522 77 3 0x100092 kqread dhcpleased 12256 192844 54522 77 3 0x100092 kqread dhcpleased 54522 510190 1 0 3 0x80 kqread dhcpleased 79467 284690 0 0 3 0x14200 bored smr 84004 80208 0 0 2 0x14200 zerothread 4859 196253 0 0 3 0x14200 aiodoned aiodoned 44296 331149 0 0 3 0x14200 syncer update 69294 475508 0 0 3 0x14200 cleaner cleaner 82507 312185 0 0 2 0x14200 reaper 6665 256254 0 0 3 0x14200 pgdaemon pagedaemon 61502 20027 0 0 3 0x14200 bored viomb 8889 239299 0 0 3 0x40014200 acpi0 acpi0 74360 72004 0 0 3 0x40014200 idle1 75231 355671 0 0 3 0x14200 bored softnet1 48150 316383 0 0 2 0x14200 softnet0 19097 183310 0 0 3 0x14200 bored systqmp 50229 69662 0 0 3 0x14200 bored systq *27557 489843 0 0 7 0x14200 softclockmp 46319 92491 0 0 3 0x40014200 tmoslp softclock 36666 243808 0 0 3 0x40014200 idle0 1 245395 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 24352 (syz-executor) thread 0xffff80003c3f8a80 (158700) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83970b08) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 #2 Xintr_ioapic_edge16_untramp+0x18f #3 _copyin+0xb #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #5 Xsyscall+0x128 Process 27557 (softclockmp) thread 0xffff8000ffffea60 (489843) exclusive rwlock maddr r = 0 (0xffff800001598078) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 mld6_fasttimo+0x8c mld6_checktimer sys/netinet6/mld6.c:-1 [inline] #2 mld6_fasttimo+0x8c sys/netinet6/mld6.c:369 #3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1 #4 timeout_run+0x159 sys/kern/kern_timeout.c:698 #5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 #6 softclock_thread_mp+0x86 #7 proc_trampoline+0x10 shared rwlock netlock r = 0 (0xffffffff83832e50) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 mld6_fasttimo+0x5f sys/netinet6/mld6.c:-1 #3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1 #4 timeout_run+0x159 sys/kern/kern_timeout.c:698 #5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 #6 softclock_thread_mp+0x86 #7 proc_trampoline+0x10 shared rwlock timeout r = 0 (0xffffffff8383b008) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 timeout_run+0x131 sys/kern/kern_timeout.c:694 #2 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 #3 softclock_thread_mp+0x86 #4 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11063 12152K 12389K 166960K 12489 0 pcb 17 13K 14K 166960K 97 0 rtable 231 7K 8K 166960K 365 0 pf 34 17K 19K 166960K 73 0 ifaddr 41 7K 7K 166960K 56 0 ifgroup 55 2K 2K 166960K 83 0 sysctl 1 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 96 0 ioctlops 0 0K 4K 166960K 1511 0 iov 0 0K 12K 166960K 9 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1405 88K 89K 166960K 1601 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 236K 166960K 367 0 sigio 0 0K 0K 166960K 2 0 proc 72 115K 164K 166960K 537 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 24 0 in_multi 89 6K 6K 166960K 94 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 400 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 256 162K 179K 166960K 5171 0 UVM aobj 9 2K 2K 166960K 9 0 pinsyscall 44 88K 109K 166960K 1484 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 22 0 NDP 12 0K 1K 166960K 34 0 temp 45 8668K 8734K 166960K 5194 0 kqueue 14 22K 28K 166960K 69 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 50 0 46 1 0 1 1 0 8 0 rtentry 176 108 0 6 5 0 5 5 0 8 0 unpcb 144 188 0 170 2 0 2 2 0 8 1 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 88 0 81 4 0 4 4 0 8 3 arp 136 17 0 0 1 0 1 1 0 8 0 inpcb 328 418 0 408 10 1 9 10 0 8 8 nd6 152 21 0 0 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 9 0 9 1 0 1 1 0 8 1 pppxif 1576 3 0 3 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 0 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 31 0 0 1 0 1 1 0 8 0 pfstkey 128 31 0 0 1 0 1 1 0 8 0 pfstate 448 31 0 0 4 0 4 4 0 8 0 pfrule 1344 25 0 20 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 430 0 18 27 0 27 27 0 8 1 art_table 40 431 0 18 5 0 5 5 0 8 0 art_node 32 108 0 15 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 5 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 5 0 0 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2025 0 515 95 0 95 95 0 8 0 ffsino 296 2025 0 515 117 0 117 117 0 8 0 nchpl 144 2535 0 834 64 0 64 64 0 8 0 vnodes 216 2259 0 0 126 0 126 126 0 8 0 namei 1024 7778 0 7778 1 0 1 1 0 8 1 percpumem 16 63 0 13 1 0 1 1 0 8 0 kstatmem 264 42 0 16 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 7894 0 7894 4 1 3 3 1 8 3 plimitpl 152 58 0 39 1 0 1 1 0 8 0 sigapl 424 688 0 618 8 0 8 8 0 8 0 knotepl 120 317 0 0 10 0 10 10 0 8 0 kqueuepl 224 91 0 81 2 0 2 2 0 8 1 pipepl 344 135 0 106 3 0 3 3 0 8 0 fdescpl 528 650 0 618 3 0 3 3 0 8 0 filepl 160 3132 0 2908 14 0 14 14 0 8 3 lockfpl 104 117 0 115 1 0 1 1 0 8 0 lockfspl 48 50 0 48 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 352 0 339 1 0 1 1 0 8 0 zombiepl 144 620 0 618 1 0 1 1 0 8 0 processpl 1232 688 0 618 6 0 6 6 0 8 0 procpl 664 1081 0 1001 8 0 8 8 0 8 0 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 752 664 0 632 14 3 11 14 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 40 0 0 5 0 5 5 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 215 0 0 14 0 14 14 0 8 0 bufpl 280 2724 0 134 185 0 185 185 0 8 0 anonpl 32 5736 0 0 47 0 47 47 0 246 0 amapchunkpl 152 15626 0 14988 27 0 27 27 0 158 0 amappl16 200 2058 0 2030 5 2 3 5 0 8 0 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 22 0 21 1 0 1 1 0 8 0 amappl13 176 519 0 517 1 0 1 1 0 8 0 amappl12 168 1015 0 971 3 0 3 3 0 8 0 amappl11 160 5 0 4 1 0 1 1 0 8 0 amappl10 152 49 0 35 1 0 1 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 33 0 30 1 0 1 1 0 8 0 amappl7 128 98 0 97 1 0 1 1 0 8 0 amappl6 120 274 0 258 1 0 1 1 0 8 0 amappl5 112 73 0 62 1 0 1 1 0 8 0 amappl4 104 412 0 382 1 0 1 1 0 8 0 amappl3 96 2581 0 2482 4 1 3 3 0 8 0 amappl2 88 770 0 694 2 0 2 2 0 8 0 amappl1 80 10271 0 9646 15 0 15 15 0 8 1 amappl 88 4401 0 4227 5 0 5 5 0 92 0 uvmvnodes 80 114 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 1 1 1 0 8 1 dma128 128 255 0 255 2 1 1 1 0 8 1 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 650 0 618 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 650 0 618 1 0 1 1 0 8 0 vmmpekpl 168 7153 0 7115 2 0 2 2 0 8 0 vmmpepl 168 48694 0 46733 93 0 93 93 0 357 2 vmsppl 488 649 0 617 5 0 5 5 0 8 0 rwobjpl 80 16055 0 14952 25 0 25 25 0 8 0 pdppl 4096 1307 0 1234 101 26 75 85 0 8 2 pvpl 32 13640 0 0 110 0 110 110 0 265 0 pmappl 256 649 0 617 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 281 0 28 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83878ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff83970900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83970900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80003c4dcd10,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83970900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83970900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 doopenat(ffff80003c3f82b8,ffffff9c,2000000000c0,100,0,ffff80003c4dd070) at doopenat+0x345 sys/kern/vfs_syscalls.c:1138 syscall(ffff80003c4dd120) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4dd120) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5ccec179630, count: 4 ddb{0}> trace x86_ipi_db(ffffffff83878ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff83970900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83970900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80003c4dcd10,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83970900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83970900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 doopenat(ffff80003c3f82b8,ffffff9c,2000000000c0,100,0,ffff80003c4dd070) at doopenat+0x345 sys/kern/vfs_syscalls.c:1138 syscall(ffff80003c4dd120) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4dd120) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5ccec179630, count: -11 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001598078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001598060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806b2ac3f0,ffff800001598000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806b2ac3f0,ffff800001598000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806b2ac300,ffffffff83987338,0,0,ffff80002a1fe590,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015aff80,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline] mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369 pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffea60) at softclock_thread_mp+0x86 end trace frame: 0x0, count: 3 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001598078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001598060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806b2ac3f0,ffff800001598000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806b2ac3f0,ffff800001598000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806b2ac300,ffffffff83987338,0,0,ffff80002a1fe590,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015aff80,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline] mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369 pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffea60) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12